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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
See below: The difference between systolic and diastolic BP is called pulse pressure. The normal range is between 30 - 60 mm. It can be widened for example in dehydration and certain valvular and muscle diseases of heart and also in senior citizen....Read more.ee below: The difference between systolic and diastolic BP is called pulse pressure. The normal range is between 30 - 60 mm. It can be widened for example in dehydration and certain valvular and muscle diseases of heart and also in senior citizen. ...Read more.